EX-10.3



 Exhibit 10.3 

TRADEMARK SECURITY AGREEMENT 

This TRADEMARK SECURITY AGREEMENT (this “Agreement”), dated as of July 23, 2018, is made by ATAATA, INC., a Delaware
corporation, and MIMECAST SERVICES LIMITED, a private company incorporated in England and Wales with registration number 4901524, (each, a “Grantor,” and collectively, the “Grantors”), in favor of JPMORGAN CHASE
BANK, N.A., in its capacity as administrative agent for the Lenders party to the Credit Agreement referred to below (in such capacity, the “Administrative Agent”). 

W I T N E S S E T H: 

WHEREAS, pursuant to that certain Credit Agreement dated as of the date hereof (as amended, restated, amended and restated, supplemented or
otherwise modified from time to time, the “Credit Agreement”), by and among MIMECAST LIMITED, a public company incorporated in Jersey with registration number 119119, as borrower, certain of its subsidiaries from time to time party
thereto, as guarantors, the lenders from time to time party thereto (the “Lenders”) and the Administrative Agent, the Lenders have agreed to extend credit and make certain financial accommodations to the Grantors; 

WHEREAS, in connection with the Credit Agreement, the Grantors, the other Loan Parties (as defined in the Credit Agreement) and the
Administrative Agent have entered into that certain Pledge and Security Agreement dated as of the date hereof (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, the “Security
Agreement”); and that certain English law Security Agreement dated as the date hereof (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, the “UK Debenture”, and together with
the Security Agreement being, the “Collateral Agreements”); and 
 WHEREAS, pursuant to the Credit Agreement and the
Collateral Agreements, the Grantors are required to execute and deliver to the Administrative Agent this Agreement; 
 NOW, THEREFORE, in
consideration of the premises and mutual covenants herein contained and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each Grantor hereby agrees as follows: 

1.    DEFINED TERMS. All capitalized terms used but not otherwise defined herein have the meanings given to them in
the Security Agreement. 
 2.    GRANT OF SECURITY INTEREST IN TRADEMARK COLLATERAL. Each Grantor hereby pledges,
assigns and grants to the Administrative Agent, on behalf of and for the ratable benefit of the Secured Parties, a continuing first priority security interest in all of such Grantor’s right, title and interest in, to and under the following,
whether presently existing or hereafter created or acquired (collectively, the “Trademark Collateral”): 

(a)    all of its Trademarks, including those referred to on Schedule I hereto,
excluding only United States intent-to-use trademark applications to the extent that and solely during the period in which the grant of a security interest therein would
impair, under applicable federal law, the registrability of such applications or the validity or enforceability of registrations issuing from such applications; 

(b)    all extensions and renewals of the foregoing; 







 (c)    all goodwill connected with the use of, and symbolized
by, each such Trademark; 
 (d)    all rights of any kind whatsoever of such Grantor accruing under any
of the foregoing provided by applicable law of any jurisdiction, by international treaties and conventions and otherwise throughout the world; 

(e)    any and all royalties, fees, income, payments and other proceeds now or hereafter due or payable
with respect to any and all of the foregoing; and 
 (f)    any and all claims and causes of action, with
respect to any of the foregoing, whether occurring before, on or after the date hereof, including all rights to and claims for damages, restitution and injunctive and other legal and equitable relief for past, present and future infringement,
dilution, misappropriation, violation, misuse, breach or default, with the right but no obligation to sue for such legal and equitable relief and to collect, or otherwise recover, any such damages. 

3.    COLLATERAL AGREEMENTS. The security interests granted pursuant to this Agreement are granted in conjunction
with the security interests granted to the Administrative Agent pursuant to the Collateral Agreements. Each Grantor hereby acknowledges and affirms that the rights and remedies of the Administrative Agent with respect to the security interests in
the Trademark Collateral made and granted hereby are more fully set forth in the Collateral Agreements, the terms and provisions of which are incorporated by reference herein as if fully set forth herein. In the event of a conflict between the
provisions of this Agreement and either the Security Agreement or the UK Debenture, the Security Agreement or UK Debenture shall control, as applicable. This Agreement shall constitute a Collateral Document and a Loan Document (as such terms are
defined in the Credit Agreement). 
 4.    AMENDMENTS IN WRITING. None of the terms or provisions of this
Agreement may be waived, amended, supplemented or otherwise modified except by an instrument in writing signed by the Administrative Agent and the Grantors. 

5.    GOVERNING LAW. This Agreement and the rights and obligations of the parties hereto shall be governed by, and
construed in accordance with, the laws of the State of New York. 
 6.    COUNTERPARTS. This Agreement may be
executed in any number of counterparts and by the different parties hereto on separate counterparts and each such counterpart shall be deemed to be an original, but all such counterparts shall together constitute but one and the same Agreement.
Receipt by telecopy or other electronic transmission (including “PDF”) of any executed signature page to this Agreement shall constitute effective delivery of such signature page. 

[Remainder of this page intentionally left blank] 







 IN WITNESS WHEREOF, each Grantor has caused this Agreement to be executed and delivered by its
duly authorized officer as of the date first set forth above. 
  

			
	GRANTORS:
	
	ATAATA, INC.
		
	By:	 	 /s/ Peter Andrew James Campbell

		 	 Peter Andrew James Campbell

Treasurer

	
	MIMECAST SERVICES LIMITED
		
	By:	 	 /s/ Peter Andrew James Campbell

		 	 Peter Andrew James Campbell
 Executive
Director




  
 [Signature Page to
U.S. Trademark Security Agreement] 









			
	ADMINISTRATIVE AGENT:
	
	JPMORGAN CHASE BANK, N.A.
		
	By:	 	 /s/ Eleftherios
Karsos                    

		 	 Eleftherios Karsos
 Authorized
Signatory




  
 [Signature Page to
U.S. Trademark Security Agreement] 








 SCHEDULE I 

to 
 TRADEMARK SECURITY
AGREEMENT 
 TRADEMARK REGISTRATIONS 
  

							
	 Trade Mark
	  	Trademark Owner	  	Application/
Registration
Number	  	Application/
Registration
Date
	 Design (m stylized)
 




	  	Mimecast Services Ltd. (UK)	  	87/666640
 5,491,407
	  	10/31/2017
				
	 Mimecast & Design (color)
 




	  	Mimecast Services Ltd. (UK)	  	87/661347
 5,491,198
	  	6/12/18
				
	 Mimecast & Design (b/w)
 




	  	Mimecast Services Ltd. (UK)	  	87/661391
 5,491,202
	  	6/12/18
				
	 MIMEOS & Design
 




	  	Mimecast Services Ltd. (UK)	  	87/662132
 5,491,234
	  	6/12/18
				
	 MIMECAST
	  	Mimecast Services Ltd. (UK)	  	3,331,029	  	11/6/07
				
	 LEGENDARY CUSTOMER SUCCESS
	  	Mimecast Services Ltd. (UK)	  	87/110336
 5,197,381
	  	5/2/2017
				
	 MIMECAST CLOUD ARCHIVE
	  	Mimecast Services Ltd. (UK)	  	87/664813
 5,491,338
	  	6/12/18
				
	 ATAATA
	  	ATAATA, Inc.	  	87/157603
 5,294,254
	  	09/26/2017
				
	 ATAATA
	  	ATAATA, Inc.	  	87/156032
 5,203,553
	  	05/16/2017








 TRADEMARK APPLICATIONS 

 

									
	 Trade Mark
	  	Trademark Owner	  	Application/
Registration
Number	  	Application/
Registration
Date	  	Status
	 Design (m in box)
 




	  	Mimecast Services Ltd. (UK)	  	87/666705	  	10/31/2017	  	Pending
					
	 TARGETED THREAT PROTECTION
	  	Mimecast Services Ltd. (UK)	  	87/662154	  	10/27/2017	  	Pending